Introductory Chemistry Practice Quiz I with Answers

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1. How many protons, electrons and neutrons are in an atom of  9 4Be ?

  • a. 4 protons, 5 electrons, and 9 neutrons
  • b. 4 protons, 4 electrons, and 5 neutrons
  • c. 9 protons, 9 electrons, and 4 neutrons
  • d. 5 protons, 4 electrons, and 4neutrons
  • e. 6 protons, 5 electrons, and 5 neutrons

2. Two Isotopes have the:

  • a. same proton number
  • b. same electron number
  • c. same neutron number
  • d. none of the above

3. Which of the following properties is NOT a characteristic of the Group 1A(1) elements (alkali metals)?

  • a. They are shiny.
  • b. They are good conductors of heat.
  • c. They react vigorously with water.
  • d. Most of them are liquids at room temperature.
  • e. They are good conductors of electricity.

4. Which compound contains a polar covalent bond?

  • a. NaCl
  • b. Cl2
  • c. H2
  • d. HCl

5. The correct electron dot structure for ammonia, NH3, is:

  • a. I
  • b. II
  • c. III
  • d. IV

6. Which of the following measurements has three significant figures?

  • a. 0.005 m
  • b. 510 m
  • c. 5.10 x 10-1 m
  • d. 5.1 x 10-2 m
  • e. 5100 m

7. If a block of wood has a mass of 1.326 kg, what is its mass in milligrams?

  • a. 1.326 x 10-6 mg
  • b. 0.1326 mg
  • c. 1.326 x 103 mg
  • d. 1.326 x 106 mg

8. Which is a physical change?

  • a. Steam is condensed to water.
  • b. Water is decomposed by an electric current.
  • c. Iron rusts in air.
  • d. A piece of paper is burned.

9. How many moles is 10. g of calcium carbonate, CaCO3?

  • a. 0.010 mol
  • b. 0.10 mol
  • c. 1.0 mol
  • d. 10. mol

10. A sample of gas with a volume of 2.0 L exerts a pressure of 1.0 atm. If the volume is changed to 1.0 L (at constant temperature), what is the pressure?

  • a. 0.5 atm
  • b. 1.0 atm
  • c. 2.0 atm
  • d. 4.0 atm

11. Calculate the molarity of a solution prepared by diluting 200.0 mL of 4.0 M HCl to 500.0 mL of solution

  • a. 1.1 M
  • b. 1.6 M
  • c. 2.7 M
  • d. 10. M

12. Which represents an acid solution at 25°C?

  • a. pH = 7
  • b. pH = 3
  • c. [OH-] = 1.8 x 10-7
  • d. [H3O+] = 6.7 x 10-8

13. The function of a buffer is to

  • a. change color at the end point of a titration.
  • b. maintain the pH of a solution.
  • c. be a strong base.
  • d. maintain a neutral pH.
  • e. act as a strong acid.

16. A hydrocarbon containing one double bond per molecule is called a(n) ____.

  • a. alkene
  • b. alkyne
  • c. alkane
  • d. cyclic hydrocarbon
  • e. saturated hydrocarbon

17. Curcumin is a compound found in tumeric. What functional group is not present in curcumin?

  • a. phenol
  • b. aldehyde
  • c. ether
  • d. ketone

18. Oxidation of which type of biomolecule provides the greatest energy per gram?

  • a. protein
  • b. lipid
  • c. carbohydrate
  • d. nucleic acid

19. Mammals can digest starch but not cellulose because starch

  • a. has alpha (1 -> 4) linkages joining glucose units, whereas cellulose has beta (1 -> 4) linkages.
  • b. is a poly-glucose, whereas cellulose is a poly-galactose.
  • c. is a carbohydrate, but cellulose is a protein.
  • d. is made by mammals, but cellulose is made by plants.

20. A difference between RNA and DNA is that:

  • a. RNA contains deoxyribose and DNA contains ribose.
  • b. RNA contains cytosine and DNA contains uracil.
  • c. RNA contains uracil and DNA contains thymine
  • d. RNA has a double helix and DNA has a single strand